550W Power Supply for X3550M5 / X3650M5 Servers — 94Y8138 94Y8139 94Y8173

Replacement 550W power supply unit compatible with X3550M5 and X3650M5 server models. Matches OEM part numbers 94Y8138, 94Y8139 and 94Y8173. Sold as a direct-fit spare or replacement to restore power to the listed server chassis—verify model compatibility before purchasing.